Grate-bar.



Patented Oct. 20, 1914.

2 SHEBTE-SHEET 1.

T. H. SLY.

GRATE BAR.

APPLICATION FILED DEC. 22, 1913.

IHL' NORRIS PETERS CO" PHOTO-LITHQ, WASHINGTON. D, C.

T. H. SLY.

GRATE BAR.

APPLIGATION FILED 13130.22, 191a.

Patented 001). 20, 1914.

2 SHEETS-SHEET 2.

il l II a combustion and to permit the, evolved gases perforated topswhich directlyfsupport the p j I I ever, such prior constructlons havebeen subfusing onto the main grate bar, rendering e To all whom/ it maymm:

THOMAS HQ-sLY, or nu'mvionn,jrnnnsrnvauih. Q j

GRATE-BAR. l

Be it known that I, THOMAS H'J Snr, a

citizen of the United States, residing": at Dunmore, countyofLackawanna, and State of Pennsylvania, haveinvented certain new anduseful Improvements in Grate-Bars, of

Whichthe following is a specification. I

This invention relates to grate bars, The proper burning of fine fuelunder a steam boiler, requires a forced draft furnished by a'fan,turbine orsteam jet blower, which in troduces theair into the ashlpit ata high pressure and the distribution of the a1r through the grate barsinto the fuel in order:

to keep the fine fuel a state of uniform toburn. The fewer dead 1 spotswhere the forced draft does not'strike; the fuel, the i better will bethe combustion and the greater the quantity of the heat units. Gratebars have also been subject to warping and burn ing out, despite theprovision ofthe 'trussing ribs commonly used inlconnection.therewith. Ithas heretofore been proposed to provide:

grate bars with supplemental or secondary burning fuel, to the end thatwarping and burning out of the mainvgrate bar may be minimized and thedistribution of, air to the fuel increased. .So'far as I am aware,howject to various defects, among whichmay be'mentioned that theconnections or manner of support of the supplemental grate barsectionshave resulted in distortion and it diflicult and sometimesimpossible to remove the supplemental sections when they are burned outor warped and require substitution of others. Another defect whichhasbeenincident to earlier constructions has been theimperfect'distribution of the air to the fuel, many dead spotsresulting-with consequent loss ofheatand imperfect combustion. a

My invention relatesto that general type of grate bar designed for theburning of fine fuel under forced draft and composed of amaingrate barhavingopenings forthe passage of the air under pressure and supplementalremovable sections which are -perforated for; the admission of the airdirect tothe fuel. j

In a grate barjof the. foregoing general type, my object is toprovideimprovedsupplemental detachablesections mounted'upon,

v Specification of jIi'etters Patent. fPat ent ea oee 2o, 1914.1:

"ApplicationiiIed DecemberQQ,1 913. sei a1N e0s, i93-" icdmieeted to,and icombined withithe will I ggra'te bar in a novelgmanner, wherebythey ;may bereadily; assembled or disconnected I i iher f seco d, to]provide thejsup'i- Plfil iental grate bar sections with severalair;

1 siipplying openings and an, improve d arrangement of air distributinggrooves or channels and {arranged and combined with the ,inaln grate'barso' that the eair'o penings are always subject to air supply and-jwhere-' iby the,..air is delivered into the bed of the ,fuelsupportedby saidsections in such man inerthat practically nof deadspots? exist Em'the f uejljan d ja morep'erfectcombustion isieffectedthan hasheretofore been possible.

T Thefinvention' consists of a grate barhav-g ing'ifconstituent partsand features'as also lnovel combinations {of elements, one em bodimentof which"'is set1 forth ,fully hereiinafter," but whichglis; to be;considered as" ,lllllStI'atlVG, rather -t-han restrictive, of the a Themainzgrate bar zsllisiprovided with ;the usual trussing ribs2' andithas'throughiont its top, between said ribs,v numerous air holes orperforationsaid qwhichzcontract 6; andFig. 9, a section on line 9 '9,Fig. 6. i

upwardly andopenhout of thefupper face ofthe grate bar',fsuchcontraction resulting in increasing the pressureofthe airllforce'dthrough theseiopenings. 1,111.: addition to the openings,lo'catedrbetween the ;ribs 2, the I longitudinal! edges \Of the grate,bar have j semi-openings 4: dwhich, together with cor j respondingopenings. .on .the" next] adjacent {grate :bar,: provide, completeopenings of substantiallythe size and forn iroftheopene ingsLSa Theresulting construction is that the only partof thej'gratefbar throughwhich the forced draft does .not'pass the relatively small, narrow arearepresenting the thickness {of theribs Q, WiththiscOna struction, Iobtain a greaterffiowiof air than has been possible with those grate jbars which ghave elongated: slots only and no feature similar to thesemi-apertures l. At

interva' ls of the longitudinalmedianlinefor axis of the grate bar,there are bolt holes 5 for the passage of the bolts 6 which "con nectthe detachable supplemental grate bar sections 7 to the main grate bar1, in super: posed relation thereto. 1

,The sections 7. are of square form, havtions7 without interfering withthe remaining sections, as for instance, when one of said sections 7 isworn out or brok n and another-has to be substitutedtherefor; I do notlimit myself to sections 7 of square form, but they are preferably ofpolygonal form having straight sides Which may be] arranged in contactwitheach other at the upper edges 10 and, preferably, the sides ofthesections 7 are downwardly sloped or beveled to minimize the contactingpart at 10 and to prevent fusing aswell as toiprovide for expansion andcontraction.

The sections 7 have legs 11 cast integral therewith, said legs restingupon the top of the grate bar 1 and against lugs 12 formed on said gratebar [1, the said lugs preventing lateral displacement of the sec tions7. The provision of the legs and the lugs causes a centering, orsecurement of the sections 7 in such fashion that but a single bolt6,located at the center'of the section, is necessary to properly securethe section to the grate bar 1,- and consequently, but one bolt has tobe unfastened to permit removal of a given section or applied to permitsecurement of a section to the grate bar.

The legs 11 support the sections 7 above the top of the grate bar 1 andthere is consequently, a free air space 18 between the main grate bar 1and the supplemental grate bar formed of the sections 7 which permits afree distribution of the air to the openings or holes 14 in the section7. The fuel being supportedv by the sections 7, instead of directly onthe grate bar 1, the latter is kept cool by the air beneath it and thatin the space 13 and there is little tendency to warp or burn out. i

The openings or perforations 14 taper upwardly like the openings orperforations 3 to choke down the air passing from space 13 into saidperforations 14 and to thereby increase the pressure. The upper ends ofthe openings or holes 14 are flared, as shown at I 15,'wh1ch morereadily distributes the air. The upper face of each section 7 isprovided with-distributing grooves or channels 16 which are wider at thetop than at the bottom to effect a thorough distribution,

of the air to the 'fin'e fuel lying on the sections 7. The flared parts15 and the grooves or channels 16 may assume different forms, and I donot limit myself, except where specified in the claims, to the design orform shown in the drawings.

One modification is shown in Figs; 6,8 and 9, where in substitution forthe holes 14, I provide elongated slots 17 which are provided withelongated flared mouths 18 for the same purpose as the mouths '15 Theface of the sections 7 is in this form, provided with grooves. orchannels 19 wider at the top than at. the bottom, and connectingthefiared mouths 18 of the different open forth and shown in thedrawings, but in the provisionof channels, however formed, communicatingwith the openings, however {formed, which extend from the bottom'to thetop of the sections 7 and, further, in

such construction combined with the flared mouths of the openings whichextend through the sections 7, whether such flared mouths be of'the formshown at 15, at 18, or of other form.

The air under pressure passing through the opening 14, or 17, spreadsout over practically the entire'upper face of the section and isdistributed with great uniformity to the fine fuel resting on thesections "7, thus insuring a high degree of combustion and minimizingdead spots in'the fuel.

The supplemental grate bar being composed of individual sections 7, and.thussplit up into a pluralityof parts, has little tende ency to warpbecause these sections have no ribs,"iare of equal thickness, and theair distribution is substantially equal over the entire supplementalgrate bar thus provided. Having thus described my invention, what Iclaim as new and desire to secure by Let- Y the rethrough and which isprovided on its upper. surface with channels extending U the main barand separated therefrom by an t v v a I lntermedlate air-space, saldsectlons bemg each provided with several air distrlbuting openingsextending from their lower to (their upper faces and communicating withsaid: air space and also having on their upper fuel supporting faces airdistributing channels extending indifferent directions lengthwise andcrosswise thereoffrom the different air distributing openings aforesaid.

3. A grate bar composed of a main part having numerous relatively smallopenings; and a supplemental part, surmounting the main part andwhose-top is raised above and separated fromthe top of the. main'part bya free air space, said supplementalpart being composed of independentlyattachable and removable sections each of which has air openingsextending therethrough and is providedon its fuel supporting sur-' facewith intersecting air distributing channels arranged lengthwise andcrosswise of the bar and communication with said openlngs. o y

, 4; Agrate barconsisting of a main'grate bar and a supplemental gratebar composed of a pluralityof sections each havinglegs resting on'themain grate barand supporting and spacing it above the main grate bar,and independent connectorsv fastening the said sections to the maingrate bar. o

o5.'A grate bar consisting of a main grate bar and a supplemental gratebar composed of a plurality of sectionseach having legs resting onthemain grate bar f and supporting and spacing it above the main grate bar;

said main. grate bar having lugs engaging the legs of the said sections,and 'independt ent connectors fastening saldsections 1ndependently tothejmain grate bar.

Intestimony whereof, I hereunto affi'x my signature in presence of, twowitnesses.

Witnesses:

GILBERT J. SLY, S. B'. BULKLEY.

copies of this patent maybe obtained for five cents each, byaddressingthe Commissioner of Ifatentls, v

Washingtomi). Q. I I

' THQMAS I-L sLY; p

